I need help configuring the Z probe

Mostly Printed CNC - MPCNC Troubleshooting
1

I have a problem configuring the Z probe on MPCNC. I am using version “V1CNC_Ramps_Dual 2.0.7.2 / 510” and my controller is a “Geeetech GT2560 rev a” of an old 3D printer.
It’s all working with engine movement and M119 Status.

  • G38_PROBE_TARGET and FIX_MOUNTED_PROBE Are enabled.
  • Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN is disabled
  • Z_MIN_PROBE_PIN 30 the same pin as Z_MIN_PIN 30
    When I send the M119 command with the probe open, the response is:
    SENDING:M119
    Reporting endstop status
    x_min: open
    y_min: open
    z_probe: open

When I close the probe contact the M119 response is:
SENDING:M119
Reporting endstop status
x_min: open
y_min: open
z_probe: TRIGGERED
When I send the Probe command:
“M0 Connect Probe\nG90\nG21\nG92 Z0\nG38.2 Z-20 F60\nG92 Z 19.5\nG0 Z10\nG90”
Z does not stop when probe contact is closed.
Any idea what’s going on?

2

On the MPCNC, we usually just use zmin endstop and then use G28 Z to probe Z. We use G38 for the low rider, because it has Z home dir set to +1.

That said, I have no idea what’s going on. That looks totally fine. If M119 says it is triggered, then there isn’t much else that could go wrong.

3

I’m with Jeff. Everything looks like it should. I’m not familiar with the board, but I looked it up, and I think you’ve done what you’re supposed to.

What happens if you run G38.2 Z -20 in isolation, without the other commands?

What happens if you change the Z probe distance to 1?

Have you tried assigning the probe to a different pin, like Zmax 32?

Are you running this from the menu, an sd card, or a terminal?

I suppose its possible that something in marlin broke again, but i haven’t messed with Marlin for cnc in a really long time.